Mạch nhánh & Đi dâyCâu 157 / 521
The dedicated equipment space above a panelboard indoors extends from the top of the equipment to what height, or to the structural ceiling if lower?
a.3 ft
b.6 ft
c.4 ft
d.10 ft
Giải thích
Section 110.26(E)(1)(a) requires the dedicated space above indoor electrical equipment such as panelboards to extend 6 ft above the equipment or to the structural ceiling, whichever is lower, kept clear of foreign piping and ducts. 3 and 4 ft are too little; 10 ft is more than the code requires.
Trích dẫn luật: 2023 NEC §110.26(E)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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